From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id A70F941B345; Wed, 4 Feb 2026 14:54:05 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1770216845; cv=none; b=Mif6hgjCr26/CTkVl44/+qXmxGRRTQCFgV6oP8oG1ibma+J+p5h++YRQb66LTLhbxa9gDAkwgZNsmP1c6y5OtwR7huaZA/jiQf2uAUDj/bffpiwPiVl74mP2YEaH/JXtdkdmXFdfZh3QwpJaT3/uA3lGKeos2MQxZY4iAEnUqns= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1770216845; c=relaxed/simple; bh=bHy6etdnpDbK4Zhx20r0Di16LAR/bPtn9tpULEcaKnY=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=M9vlCDwHa99pGvfpf2rJWicKmdmcmzBs8cK/O0EdromESTatBIFO4yKjAPF/7RgeAE/65AGng+HShRWHaIAFYRv03Mzy7Q8WdCntHeYQJ2aX4VdizZ3hov462HJzVBESCOEc4riqPwfFhqtHEYTB2dssqwqrHrO+yHONkgLzqNk= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=KnJXFyRh; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="KnJXFyRh" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 2EE4AC4CEF7; Wed, 4 Feb 2026 14:54:05 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1770216845; bh=bHy6etdnpDbK4Zhx20r0Di16LAR/bPtn9tpULEcaKnY=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=KnJXFyRhI14FmL1q6QmpxhlOd8hW0KK3POAvflTx0PVPG3K7DmSGxZ5Ka3bGIwSQu RNS1VA3ZgjWsxlYjerRLGz7f+gyiZaFNqC1LWnYGPII4ZfOjUpQEZoIZzu5UM1DHGU v849+jCKcnjt4wclAsP+V6/gemuI6Vmvw/R9Ma08= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Johan Hovold , Vladimir Zapolskiy , Vinod Koul Subject: [PATCH 5.15 048/206] dmaengine: lpc18xx-dmamux: fix device leak on route allocation Date: Wed, 4 Feb 2026 15:37:59 +0100 Message-ID: <20260204143859.945833025@linuxfoundation.org> X-Mailer: git-send-email 2.53.0 In-Reply-To: <20260204143858.193781818@linuxfoundation.org> References: <20260204143858.193781818@linuxfoundation.org> User-Agent: quilt/0.69 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 5.15-stable review patch. If anyone has any objections, please let me know. ------------------ From: Johan Hovold commit d4d63059dee7e7cae0c4d9a532ed558bc90efb55 upstream. Make sure to drop the reference taken when looking up the DMA mux platform device during route allocation. Note that holding a reference to a device does not prevent its driver data from going away so there is no point in keeping the reference. Fixes: e5f4ae84be74 ("dmaengine: add driver for lpc18xx dmamux") Cc: stable@vger.kernel.org # 4.3 Signed-off-by: Johan Hovold Reviewed-by: Vladimir Zapolskiy Link: https://patch.msgid.link/20251117161258.10679-8-johan@kernel.org Signed-off-by: Vinod Koul Signed-off-by: Greg Kroah-Hartman --- drivers/dma/lpc18xx-dmamux.c | 19 ++++++++++++++----- 1 file changed, 14 insertions(+), 5 deletions(-) --- a/drivers/dma/lpc18xx-dmamux.c +++ b/drivers/dma/lpc18xx-dmamux.c @@ -55,30 +55,31 @@ static void *lpc18xx_dmamux_reserve(stru struct lpc18xx_dmamux_data *dmamux = platform_get_drvdata(pdev); unsigned long flags; unsigned mux; + int ret = -EINVAL; if (dma_spec->args_count != 3) { dev_err(&pdev->dev, "invalid number of dma mux args\n"); - return ERR_PTR(-EINVAL); + goto err_put_pdev; } mux = dma_spec->args[0]; if (mux >= dmamux->dma_master_requests) { dev_err(&pdev->dev, "invalid mux number: %d\n", dma_spec->args[0]); - return ERR_PTR(-EINVAL); + goto err_put_pdev; } if (dma_spec->args[1] > LPC18XX_DMAMUX_MAX_VAL) { dev_err(&pdev->dev, "invalid dma mux value: %d\n", dma_spec->args[1]); - return ERR_PTR(-EINVAL); + goto err_put_pdev; } /* The of_node_put() will be done in the core for the node */ dma_spec->np = of_parse_phandle(ofdma->of_node, "dma-masters", 0); if (!dma_spec->np) { dev_err(&pdev->dev, "can't get dma master\n"); - return ERR_PTR(-EINVAL); + goto err_put_pdev; } spin_lock_irqsave(&dmamux->lock, flags); @@ -87,7 +88,8 @@ static void *lpc18xx_dmamux_reserve(stru dev_err(&pdev->dev, "dma request %u busy with %u.%u\n", mux, mux, dmamux->muxes[mux].value); of_node_put(dma_spec->np); - return ERR_PTR(-EBUSY); + ret = -EBUSY; + goto err_put_pdev; } dmamux->muxes[mux].busy = true; @@ -104,7 +106,14 @@ static void *lpc18xx_dmamux_reserve(stru dev_dbg(&pdev->dev, "mapping dmamux %u.%u to dma request %u\n", mux, dmamux->muxes[mux].value, mux); + put_device(&pdev->dev); + return &dmamux->muxes[mux]; + +err_put_pdev: + put_device(&pdev->dev); + + return ERR_PTR(ret); } static int lpc18xx_dmamux_probe(struct platform_device *pdev)